In one embodiment, a lead extension comprises: a lead body a plurality of conductors disposed within the lead body a plurality of terminal contacts on a proximal end of the lead body, wherein the plurality of terminal contacts are electrically coupled to the plurality of conductors and a housing structure disposed at a distal end of the lead body, the housing structure enclosing a plurality of electrical connectors for making electrical contact with terminal contacts of a stimulation lead, wherein the plurality of electrical connectors are electrically coupled to the plurality of conductors the housing structure comprising an outer body of a first material and an inner reinforcing structure of a second material, wherein the first material is a relatively pliable biocompatible polymer material and the second material is a relatively rigid material, the reinforcing structure holding the plurality of electrical connectors in a relatively fixed arrangement.
